import logging import ctypes import os import inotify.library _LOGGER = logging.getLogger(__name__) _LIB = inotify.library.instance class InotifyError(Exception): def __init__(self, message, *args, **kwargs): self._errno = ctypes.get_errno() try: self._errmsg = os.strerror(self.errno) except: self._errmsg = '' message += " ERRNO=({}) [{}]".format(self._errno, self._errmsg) super(InotifyError, self).__init__(message, *args, **kwargs) @property def errno(self): return self._errno @property def errmsg(self): return self._errmsg def _check_zero(result): if result != 0: raise InotifyError("Call failed (should return zero): (%d)" % (result,)) return result def _check_nonzero(result): if result == 0: raise InotifyError("Call failed (should return nonzero): (%d)" % (result,)) return result def _check_nonnegative(result): if result == -1: raise InotifyError("Call failed (should not be -1): (%d)" % (result,)) return result inotify_init = _LIB.inotify_init inotify_init.argtypes = [] inotify_init.restype = _check_nonnegative inotify_add_watch = _LIB.inotify_add_watch inotify_add_watch.argtypes = [ ctypes.c_int, ctypes.c_char_p, ctypes.c_uint32] inotify_add_watch.restype = _check_nonnegative inotify_rm_watch = _LIB.inotify_rm_watch inotify_rm_watch.argtypes = [ctypes.c_int, ctypes.c_int] inotify_rm_watch.restype = _check_nonnegative if getattr(_LIB, 'errno', None) is not None: errno = _LIB.errno elif getattr(_LIB, 'err', None) is not None: errno = _LIB.err else: raise EnvironmentError("'errno' not found in library")